How to measure a surface terrain area easily?

I have created a 3d model (*.obj) and i can read it using meshlab very well but i need to measure a surface part of the 3D render following the terrain, is there any tool to do that easily? Im using meshlab because its free but if there is another app that can do that faster i can change.
Thanks for the help.

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Could you provide a bit more detail and maybe a drawing/screenshot?

QGIS has some great profile tools which might help (you’d be working off the DSM/DTM for this).

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